Key press

Majestros · 07-09-2004, 05:29 AM

Hi,
i need write a C/C++ program for create a batch application that for each characters read from serial port create a key press event as the character was generate from user action (key press).

How it's possible? I must emulate the key press.

Tank's to all!

keefaz · 07-09-2004, 08:28 AM

I don't know if you want to simulate key stroke in X, here is an example code that will open gvim and 'type' hello world. (replace gvim by your prefered text editor if you want, in this case remove the XK_a wich is needed to enter insersion mode in gvim)

Code:

/* it is compatible with latin keyboard */
#include <X11/extensions/XTest.h>
#define XK_LATIN1
#define XK_MISCELLANY 
#define XK_XKB_KEYS
#include <X11/keysymdef.h>
#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
    Display* pDisplay = XOpenDisplay( NULL );

    KeySym key[] = { XK_a,XK_h,XK_e,XK_l,XK_l,
                     XK_o,XK_space,XK_w,XK_o,
                     XK_r,XK_l,XK_d,XK_Return };
    int i;

    system("gvim");

    for( i = 0; i < 13; i++ )
    {
        XTestFakeKeyEvent ( pDisplay, XKeysymToKeycode( pDisplay, key[i] ),
                                True, CurrentTime );
    }

    if( pDisplay == NULL ) return 1;

    XCloseDisplay(pDisplay);
    return 0;
}

Save as keystroke.c and compile with :
gcc -I/usr/X11R6/include -L/usr/X11R6/lib -o keystroke keystroke.c -lX11 -lXtst

veeren · 02-14-2007, 03:42 AM

Hi guys, is there any body out there who can help me with simulating key press stuff ..I landed on this post which tells me one method on how can one simulate key press..

Problem:
I have one window that I want to close..the window can be closed if I press Escape key. Now I want to do the same thing by using a code..while I know that I can also use XcloseDisplay() routine, but using XTestFakeKeyEvent can also serve my other purposes like if I want to perform some other task by pressing some other key.

Here is what I do:
1: I search the desired window that is to be closed. I get the window id w for this target window.
2. I use XSetInputFocus() to set the focus of keyPress to window w.
3. I use XWarpPointer() to move my pointer to target window.
4. Now I use XTestFakeKeyEvent() to simulate a keypress similar to what has been suggested in email above. but nothing seems to happen. Is there any step I am missing?

Thanks in advance.
Veerendra